Author Topic: Main wiring harness routing  (Read 4637 times)

Offline Johny Boy

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Main wiring harness routing
« on: April 08, 2026, 11:52:32 AM »
Hi all, my rebuild is just about done, just the electrics to connect up.

Could someone help me with a dumb question?
where should the main harness end be secured?
I.e. under the tank or behind the headlight?

The harness is long enough to go up to the headlight area, but the cables from the handle bars are also long enough to reach under the tank!

I'm thinking it would look neater under the tank, but would appreciate your views

Thanks John
CB550 (85% there)
New BSA Goldstar (my daily)
MV Agusta F4 750 Senna (Front room love affair)
BSA bantam (my constant pain in the arse)

Offline mickwinf

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Re: Main wiring harness routing
« Reply #1 on: April 08, 2026, 12:20:27 PM »
Depends on exact model, f1 and r2 join in a box under tank and others in headlamp.
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline Oddjob

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Re: Main wiring harness routing
« Reply #2 on: April 08, 2026, 02:30:12 PM »
Far too many block connectors in that pic for an F1 or F2. The K3 uses them on the handlebars switches wires but they should go into the headlight, so why so long?

Good wiring/cable diagram in the back of the workshop manual and PDI instructions for the 550. Really helpful especially for the cable routing, which is critical on these bikes.
Kids in a the back seat cause accidents.
Accidents in the back seat cause kids.

Offline Johny Boy

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Re: Main wiring harness routing
« Reply #3 on: April 08, 2026, 03:45:28 PM »
Thanks for that, she is a K3 but the switch gear are after market replacements, maybe that's why they are so long!

But that does answer my question, I will have a look at the documents you suggest
CB550 (85% there)
New BSA Goldstar (my daily)
MV Agusta F4 750 Senna (Front room love affair)
BSA bantam (my constant pain in the arse)

Offline Oddjob

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Re: Main wiring harness routing
« Reply #4 on: April 08, 2026, 04:38:13 PM »
Clearly a new loom. Does it have the correct blocks connectors fitted for the switchgear?
Kids in a the back seat cause accidents.
Accidents in the back seat cause kids.

Offline Johny Boy

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Re: Main wiring harness routing
« Reply #5 on: April 08, 2026, 06:03:32 PM »
Yes it is and does have all the right connectors on
CB550 (85% there)
New BSA Goldstar (my daily)
MV Agusta F4 750 Senna (Front room love affair)
BSA bantam (my constant pain in the arse)